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The Comparative Susceptibility of Anopheles Quadrimaculatus, Say, and Anopheles Punctipennis, Say, to Plasmodium Vivax, Grassi and Feletti, and Plasmodium Falciparum, Welch¹

Anopheles quadrimaculatus and A. punctipennis are approximately equally susceptible to both strains of P. vivax employed in our experiments. A. quadrimaculatus possesses some degree of susceptibility to all of the strains of P. falciparum we have employed, but A. punctipennis varies from a high susceptibility to a probable refractoriness to different strains.

Since in Florida A. punctipennis is at its seasonal minimum during the summer months, it does not appear likely that, despite its susceptibility, it is a factor of any consequence in the propagation of the malaria parasites. However this opinion may not apply to the northern part of the United States, where it is a summer species.

Received September 5, 1935.
¹ The studies and observations on which this paper is based were conducted with the support and under the auspices of the International Health Division of the Rockefeller Foundation, in coöperation with the Florida State Board of Health and the Florida State Hospital.